15,000 scientists say threats to planet now 'far worse'

More than 15,000 global scientists from 184 countries signed on to the letter, called the "World Scientists' Warning to Humanity: A Second Notice," published in the journal BioScience. The initial version, released in 1992 by the Union of Concerned Scientists, was signed by 1,700 experts. Since then, nearly all major threats to the environment have grown more dire, particularly the booming world population, which has added two billion people since 1992, a 35 percent increase, according to the update.

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